docs: def _starttls(self):
          """
          Exchange a STARTTLS message with Riak to initiate secure communications
          return True is Riak responds with a STARTTLS response, False otherwise
          """
          resp_code, _ = self._non_connect_send_recv(
              riak.pb.messages.MSG_CODE_START_TLS)
          if resp_code == riak.pb.messages.MSG_CODE_START_TLS:
              return True
          else:
              return False